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Our 10 years of Lithium Iron Phosphate experience shared within thousands of articles, hundrends of tests and examples.


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16.02.2018
 
3.2V LFP cell initial charging

Question: How should new cells 3.2V  40AH, 60AH, 90AH, 100 AH, etc. be formed before first usage?

Answer: The new 3.2V LFP cells delivered from the warehouse are partially charged. However before the first use, it is essential to charge each cell to full capacity. The initial charging should be done with the charging current set to less than 1C (typically 0.5C), till the voltage level of 4.0 V is reached.

There is no other need for LFP 3.2V cells to be formatted or otherwise specially prepared for the use. After the first charge to full, the cell is ready to be used for use.

The above charging rule is also applied to the initial charge after the cell has been unused or stored for a long time. If not used more than 1 month, it is recommended to make again an initial charge to full.

   ...more >>

16.02.2018
 
12V LP battery balancing and charging

Question:  Can I charge the 12V LFP battery using a conventional auto-moto charger 12V?

Answer:  With most of “cheap” car battery chargers you **cannot** charge the 12V LFP battery. Cheap chargers often end charging at 14V.  As a result the LFP batteries are not charged sufficiently. In order to charge to full you need to reach above 16V.

If you have an “advanced” manageable charger, it can be used provided you can set the charge level to at least 16V.

Simply said: you can charge with any kind of charger if you make sure that the battery voltage reaches at least 16V, but does not exceed the maximum limit of 17V.

 

Question: What are the experiences of balancing 12V batteries, when, for example, four pieces of 12V/40Ah in the series?

   ...more >>

16.02.2018
 
You must charge the LiFePO4 before the first use!

Charge levels

 

You must charge before the first use!

We remind all users of the LFP cells and LP batteries that the cells and batteries MUST be charged to full voltage level BEFORE assembling into a pack and before starting to be used.

For the 3.2V cells, the full charge voltage level is 4.00V and the charging is described here.  For the 12V LP batteries the full charge voltage level is 16.00V. More details about the use of 12V batteries is here.

   ...more >>

16.02.2018
 
Using BMS to analyze the cell performance

BMS settings charge voltage

 

Why is the BMS needed for a LFP battery pack consisting of many cells?

Answer: The Battery Management System (BMS) allows you to monitor the battery pack operation. Since the battery consists of a serial string of many cells, you need to monitor each cell to prevent from deep discharge or over charge.  The BMS will give you information about the cell voltage levels and can issue warnings if there is a problem with any of the cells.

The BMS with balancing option will balance the cells (usually during charging) to make sure all cells have the same capacity (=voltage) levels.

The BMS also allows data logging so that you can see the history of the operation of the each cell in the battery. This way you can detect if there is any problem with one or more cells in the battery pack.

16.02.2018
 
Initial charging FAQ

Initial charging FAQ

Check these FAQ published on our blog to understand the initial battery charging

 

We remind all users of the LFP cells and LP batteries that the cells and batteries MUST be charged to full voltage level BEFORE assembling into a pack and before starting to be used.  source

The new 3.2V LFP cells delivered from the warehouse are partially charged. However before the first use, it is essential to charge each cell to full capacitysource

   ...more >>

16.02.2018
 
Maximal voltage during Initial charge of LiFePO4

Maximal voltage during Initial charge of LiFePO4

 I want to make the initial charge of all the LiFePO4 cells to the same maximal voltage level of 4.0V. How can I do that?

 

EDIT: This article gives the example of 4.00V charge level. The same information is to applied for charging to other voltage levels: e.g. 3.65V, 3.70V, 3.80V, 3.90V. Different voltage levels may be applied for initial charging based on the manufacturer specification.

ANSWER: The best way it to find a power supply or a charger that will charge to the 4.0V directly.  Another solution is to charge using the laboratory power supply or the regulated power supply that allows to set the final (maximal) voltage limit. We suggest to check with the local electronic components suppliers for these products.

   ...more >>

16.02.2018
 
Initial charge voltage levels of LiFePO4

Voltage levels of LiFePO

 

 Initial charge voltage levels

Question: I wish to equip my workshop with the proper tools. Can you offer me following chargers: one model with cut off voltage at 3.65V, one model with cut off voltage at 3.80V and one model with cut off voltage at 4.00V?

Answer: There is no need to have so many different chargers.  The typical chargers that are sold by GWL charge to 3.65V (for single cell).  Please see some additional comments.

   ...more >>

09.02.2018
 
Sudden battery discharge

Sudden discharge of LiFePO4

FAQ: “Sudden” battery discharge

I have bought a several of LFP cells and made the pack with them to replace the lead-acid battery in my houseboat. The LFP battery was working great and it gives much more capacity than the lead acid. However after several weeks of usage, I came back after the weekend and I found out that the battery is completely discharged. Why this happen?

Please note that unlike the lead acid batteries, the LFP batteries will be completely damaged if you discharge them bellow the minimal voltage (usually >2.5V per cell, or bellow 10V for 12V battery). This may happen if you have some equipment that takes the power from the battery continually. Maybe you simply forget some light or some equipment „on“, and after few days the battery is deeply discharged and damaged forever.

   ...more >>

30.01.2018
 
Can you recommend a device to protect a 12V LP battery?

 

Can you recommend a device to protect a 12V LP battery?

In the past we used to offer a solution called Akumon. However due to a small demand, the production of Akumon was discontinued. We also offered some Battery Guard, Battery protector, Battery protect, PowerTector, etc.  

   ...more >>

21.12.2017
 
BMS S05 - Introductory information

     

 

The BMS S05 is the next generation of modular BMS that follows the BMS2405 product line. 

The BMS2405 is designed for up to 24 cells. The  BMS S05 is stackable and allows to connect up to 144 cells (6x 24 cells). 

The BMS S05 has many rich settings and advanced functions. This BMS is designed for industrial projects and applications. Please contact us for more details to learn more about the BMS S05. 

21.12.2017
 
The voltage levels for BMS

 

he BMS provided by GWL are primarily designed for the LFP cells (2.0V to 3.8V). Some BMS models support the LTO and Li-Ion cells as well. 

BMS123Smart - supports LFP and Li-Ion, does not support LTO 

BMS2405 - supports LFP,  Li-Ion and LTO

   ...more >>

20.12.2017
 
Checking and checking again

   

 

Any system can have a failure or an irregular operation. That is why it is important to perform multiple tests and verifications of each installation.

With battery systems the possibility of a failure or malfunction is multiplied by the number of the cells or the complexity of the installation. For a system with 2 cells, with 20 cells and with 200 cells the possibility of “problem” will be multiplied 2 times, 10 times and even 100 times.

The photo shows an example of a failure of the BMS system in a 4 cell installation. The BMS module reports a voltage and temperature that is not correct. Making a measurement of the cell proves the failure condition of the setup. In this case, caused by a defective BMS module that needs a replacement.

Our recommendation: the battery pack should have regular inspections and verifications performed.

20.12.2017
 
AutarcTech - energy storage partner in Germany

    

 

The AutarcTech company is using the cells from GWL to make the energy solution. Learn more about  AutarcTech and their products. 

AutarcTech GmbH
Technologiepark 1
91522 Ansbach
Deutschland
Tel. 0981 9878 7374
www.autarctech.de

AutarcTech GmbH, founded 2010 in Ansbach, Germany, designs and produces Lithium batteries and Batterie-Management-Systems (BMS).

Our next-generation technology sets us apart from the standard battery storage systems. Active balancing significantly increases life-expectancy of the lithium cells. This process is automatically performed when required during the entire charge and discharge cycle. The effective useable capacity of the battery is maintained. Because the energy from one cell is transferred to another, the balancing process does not rely on wasting energy to heat and becomes far more efficient.

   ...more >>

18.12.2017
 
GWL/Power Simple Battery Management Board 4 cells (12V/16A)

 

The SBM04/16H is designed for a simple protection of the 12V battery packs using the 3.2V LFP cells. 

The SBM has higher rating resistors (bigger ones) so that the balancing current is little bigger. For even higher balancing currents we suggest adding the CBM1 module or modules. The examples of the installation are here: 12V battery24V battery48V battery.

18.12.2017
 
SBM for 24 cells (72V)

 

The SBM board SBM24/40 is specially designed for high-power EV-Bikes and e-Scooter projects with voltage 72V (24 LiFePO4 cells).

18.12.2017
 
BMS123 Smart with Victron inverters

 

Check the connection of the BMS123 Smart with thetThe Victron inverters: These are equipped with AUX I/O (allow to charge) and Temp sense (allow to discharger ports. The charge/discharge contact functionality is available only in case the Lithium assistant function is activated.

18.12.2017
 
GWL/Power BMS123 Smart - Extended Module

BMS       bms_smart

 

Extended module for advanced applications like automotive, boat and other applications using the BMS123 Smart.

The module adds the following functionality to the BMS123 Smart system:

  • 4 configurable relays - switch relay on at time or conditions
       
  • 2 individual CAN bus connections
      
  • Control Elcon/TC Charger via CAN bus interface
     
  • Broadcast BMS settings on CAN bus
      
  • Compatible with EV charging stations using the J1772/IEC 62196 protocol - adaptive charging. Extended module limits charging current to the maximum current of the charging station/vehicle.
      
  •    ...more >>

09.11.2017
 
BMS123 Smart By Pass Voltage Settings

 

The BMS123 Smart supports both LFP (3.2V) technology and Li-Ion (3.7V) technology. The voltage of the cells is determined by the V-Bypass setting. The value between 3.4V and 3.7V is for the LFP cells. The values for the 4.0V to 4.3V are for the Li-Ion cells

23.08.2017
 
How to connect DC contactors to BMS123Smart

 

Question: how to plug protective relay to BMS 123 smart?

Answer: two relays, one disconnects the charger if any cell is charged at the set value

and the relay releases the load when the voltage drops below any set point

R1 Load relay

R2 Charging relay

 

 

 

17.08.2017
 
do I have to buy DC contactor or relay for BMS2405 to disconnect battery to avoid overdischarging?

Question: how to protect the battery from being polluted by the BMS 2405 using a disconnecting relay

Answer: For "disconnecting relay", pin 2 of the system connector (Ignition output)

the voltage on this pin is equal to the total battery voltage, for a closer understanding of the function is the diagram in the BMS2405 manual on page 11

21.04.2017
 
How to install modules of BMS123 Smart

If you install the BMS123 Smart use only insulated tools and be carefull when you install the modules to do not make short circuit at the cell.

The module will be demaged if the communication cable will be connected with the terminal of the cell during the instalation.

Install the modules by following steps:

 

  1. Install the plus terminal of the IN modul on the first cell (plus terminal is plus of the whole pack)
  2. Install the minus terminal of the IN module on the minus terminal of the first cell
  3. The green LED of the IN module starts blinking
  4. Continue with installing of the middle module as in the 1. and 2. steps on the second cell
  5.    ...more >>

22.03.2017
 
How to manage chargers by BMS123 Smart Extended module

You can use the BMS123 Smart with Extended Module to control of charging by Chargers for LFP/LTO with BMS input (POWxxVxxA-D1).

Following example shows how to reduce charging current in case the one LiFePO4 cell excede 3.6V and stop the charging in case the one LiFePO4 cell excede 3.65V. The charging starts again at higest current in case the cell will have lower voltage then 3.5V. The cell is one of all in the battery pack with highest voltage level.

Connection Diagram:

 

 BMS+charger

The LFP/LTO Chargers D1 are supply with BMS connection cable. The blue wire is connected to the PIN6, brown wire to the PIN5 and green wire to the PIN1 and PIN2 of the 8PIN connector in Extended module.

   ...more >>

06.03.2017
 
How to connect Victron inverters with Smart123BMS - charge-discharge signals

The Smart123BMS is popular system due to reliability and user friendly monitoring. This system is equiped by Charge and Discharge relays which should manage other devices of the whole solar system.

Victron Energy Lithium battery systems (Multi or Quattro) are also possible to connect to the system from another manufacturer. The Battery Management Systems (BMS) will need to have control of the charging and discharging of the battery in most installations. They will want to stop the charging process when the maximum cell voltage increases above a threshold and also they will want to switch off a loads that are discharging the battery pack when the minimum cell voltage drops below lower threshold.

The Victron inverters are equiped by AUX I/O (allow to charger) and Temp sense (allow to discharger) ports. The charge/discharge contact functionality is working in case the "Lithium assistant" is activ only.

These ports are connected to the relays of Smart123BMS OUT board by following diagram.

smart123bms-victron

   ...more >>

25.11.2016
 
What BMS is suitable for LFP/LTO/Li-Ion cells

Each Lithium technology of cell has different voltage levels and the BMS must support the Low (discharge) and High (charge) voltage level of the cell.

Following table shows the lowest and higest supported voltage values. YES means the BMS supports the technology.

 

 Graph


*The minimum amount of LTO cells at BMSs05 is 7pcs in serial connection. The reason is total system minimum voltage 11V.
 

Please note the SBM/CBM modules have fixed voltage levels. So read discription of SBM module carefuly to meet the cell voltage requirements.

11.05.2015
 
For more information about BMS Systems please visit technical blog GWL Power

For more information about BMS Systems please follow technical blog GWL Power.

18.11.2014
 
BMS123 shows nonsense

What to do if BMS123 shows red "L" symbol, but all cells have correct voltage? My BMS123 OFF GRID sofware looks like this picture and shows red "L" symbol. I checked cells voltage with multimeter and all are 3.3V. What is wrong?


Screenshot of BMS123 OFF GRID not communicating with balancers


1) Please take in advance that BMS123 software will show red "L" warning anytime when VOLTAGE OR TEMPERATURE are BELOW levels  pre-set in dashboard (setup menu of BMS123). Please first double check your settings in the dashboard. 

2) In case of error in communication between BMS Main Controller communication and balancing modules software always shows minimum possible values. This is the reason why "L" indicator is on. If BMS123 communication is working, GREEN LEDS AT BALANCING MODULES AND INSIDE MAIN CONTROLLER UNIT MUST BLINK IN SEQUENCE. If they are not blinking, please check your connection with user manual.

Green light in left-bottom corner indicates only correct USB communication.

25.07.2014
 
Battery Management choice

What is appropriate product for the balancing of battery cells?

----------------------------------------------------------

First, it is important to realize what the real charge current in the circuit for the end of charging.
So about voltage from 3.55V - 3,6V for Cell, here is recommended to start balancing.

We offer a variety of products, ranging from a simple module CBM1
to professional BMS system with data bus and control unit.

- CBM1 modules are passive modules for the balancing.
These modules do not solve the issue of monitoring the status of the battery.
These modules are therefore necessary to supplement with the monitoring unit CellLoger
http://www.ev-power.eu/_d1747.html
Please note, that CBU1 balancing maximum current of 1.7 A.

If the charging current of 20A for example, then the balancing 1.7 A weak,
because it will flow into the battery further difference of these currents. Thus, in this case the remaining charging current of about 18A.
So it may be required to compose multiple modules CBM1 parallel to each other, to the balancing flow increased.
See real circuit examples here:
http://gwl-power.tumblr.com/tagged/CBM
It is also   ...more >>

04.06.2014
 
Battery bank

How to make 12V 400 Ah battery bank?

----------------------------------------------------------

You should use 4x 400Ah LiFePO4 cells to acheive 12V battery pack.

http://www.ev-power.eu/Winston-300Ah-1000Ah/WB-LYP400AHA-LiFeYPO4-3-2V-400Ah.html

Proposed cells have total capacity 4.8 kWh which is ideal for delivering continuous power up to 2 kW. Remember that such a battery can stand much higher discharging currents (continuous 4.8kW at 1C, peak 14,4kW at 3C, during short bursts it is even more).

First of all, the battery should contain some kind of cell protection or at least monitoring equipment installed.

BMS options:

1. GWL/Power Cell Logger 8 cells

Unless you have something else for battery protection this device is fundamental. It will tell you everything you need – each cell voltages. Cell logger contains alarm output which can be used to disconnect charger or load when any cell goes out of given limit. Here are some details of such an installation:
http://gwl-power.tumblr.com/tagged/CellLog

   ...more >>

26.05.2014
 
SBM voltage protection

Why the SBM module set as low as 2V limit for protection during discharging?
----------------------------------------------------------
The SBM is designed for small capacity cells. When discharging with peak currents, the voltage on these cells may go as low as 2.0V. In order to prevent randome disconnection under big loads, the voltage of the SBM is set to 2.0V per cell. The SBM is a simple low cost solution to allow simple monitoring of battery packs. The SBM should be viewed as a lowevest level of the cell protection. We suggest to monitor the voltage of the whole pack as well and stop discharging when the voltage gets low. Please see the explanantion here: http://gwl-power.tumblr.com/post/72167031736/bms-versus-circuit-breaker-understanding-the-bms

We suggest to use BMS for systems that need complete battery
   ...more >>

28.01.2013
 
RT-BMS Summary of Technical Information and FAQ

RT-BMS Summary of Technical Information and FAQ

Check the updated document with the summary of the technical information, sepcification and FAQ for the RT-BMS system.

http://www.ev-power.eu/docs/pdf/GWL/GWL-RT-BMS-TECH-EN.pdf

The RT-BMS pricing is here:
http://www.ev-power.eu/RT-BMS-System/

27.01.2013
 
The BMS123 control software features

The BMS123 control software features

The BMS123 software screen (called dashboard) can display the min and max voltage level of the cells in the pack. When you position the mouse pointer over the number, you can see the actual number of the cell that has the MIN/MAX value.

The same status information is for the temperature of the cells.

12.01.2013
 
The 5 kWh Universal Energy Storage Setup

The 5 kWh Universal Energy Storage Setup

A practical realization of a mid-sized energy storage solution with 5 kWh of energy capacity. The modular design to work with the 230V AC grid.

The practical demonstration of the basic components to realize the energy storage solution with an easy expansion and many options to increase the size of the storage and the power output.
 
Components description of the universal energy storage

* Lithium Battery Pack 36V
Battery pack 36V 130Ah made of 12 units of finely balanced  SE130AHA LiFePO4 cells. The nominal capacity is 5 KWh of energy (38V x 130Ah).  Bigger sized cells can be easily used to increase the total capacity of the storage.
http://www.ev-power.eu/_d2904.html (USD180 per unit, total USD 2160 for 12 pcs)
 
* BMS system - BMS123 Solution 
The BMS system protects the batteries against deep discharge and against over charge. It also monitors every cell and provides data to the BMS Main Controller. Each cell has the BMS Cell Module installed. The setting is set for 44V as max charge voltage (3.70V per cell) and 35V as deep discharge voltage (2.95V per cell). The BMS is powered from a 12V battery independently of the main power battery.
http://www.ev-power.eu/BMS123-System/ (USD430 Main Unit, USD200 Cell Modules, USD150 additional components)
 
* DC contactor relay
The relay is designed to disconnect the DC/AC inverters from the batteries in case of deep voltage discharge.  The DC contactor is managed by the BMS Main Controller. http://www.ev-power.eu/_d2649.html (USD20)
 
* DC/AC Grid-tied   ...more >>

17.12.2012
 
BMS123 - a complete BMS solution

Get the revolutionary BMS system now!

The 123BMS is the latest innovative solution for the lithium cell and battery pack monitoring and management.  The 123BMS brings to you the complete system for charging and balancing or LiFePO4/LiFeYPO4 cells and batteries.  

Simple installation, easy settings, easy and reliable operation.

In this fully modular system each cell is equipped with a small size circuit-board. Using only a single wire (or twisted wire) these boards are linked to the BMS Main Controller. The controller gathers all relevant data (the number of cells, cell-address, cell-voltage, cell temperature, bypass-current and total-voltage of the battery-pack) in order to control the operation of the battery pack.

The TOP reasons why to use the 123BMS

  • Monitoring and balancing function for each cell
  • Small size board installed directly at the terminals of each cell
  • Single wire communication. Easy to assemble the battery pack
  • Excellent pricing ratio: robust and reliable system at good price
  • Direct connection and management of the ELCON chargers (TC Charger models)
  •    ...more >>

03.12.2012
 
BMS123 - Current and Fuel Meters

BMS123 - Current and Fuel Meters

With these analog meters you can get an easy indication of the batery capacity and the output current.

http://www.ev-power.eu/BMS123-System/

03.12.2012
 
Check the BMS123 manual

BMS123 - Components of the system

The BMS123 system contains these components: the Main Controller, the Current Sensor, the Cell Modules.

Check the BMS123 manual
http://www.ev-power.eu/docs/pdf/BMS123_Manual_v1_0.pdf

Download the BMS123 software
http://www.ev-power.eu/docs/bin/Setup123BMS_v1.2.0.zip

03.12.2012
 
BMS123 - BMS Main Controller

BMS123 - BMS Main Controller

The photos of the BMS123 Main Controller and the Current Sensor.

http://www.ev-power.eu/BMS123-System/

29.11.2012
 
BMS123 - Installation progress

BMS123 - Installation progress

Rough wiring of the BMS for testing purposes

25.11.2012
 
SBM04/10 - same product - different cabling

SBM04/10 - same product - different cabling

The photo shows different modification of the same product. One version has the connector to the battery terminals, the other is designed to have the wires soldered. The function of the product is identical. For logistic reason a different version may be delivered, as available from the manufacturer. Thank you for your understanding.

Check the SBM products here: http://www.ev-power.eu/SBM-CBM-1-1/

25.11.2012
 
Installation of the BMS123 modules

Installation of the BMS123 modules

See detailed photo of the installation of the BMS123 cell balancing modules.

20.11.2012
 
Akumon -  check the function (if delivered in 2012)

Akumon -  check the function (if delivered in 2012)

Some of our partners have reported that Akumons from last shipments in 2012 were not working properly. We kindly ask all customers to check the Akumon function. In some cases the Akumon may discharge the battery continually until the battery is fully depleted. If you need any help, please contact our technical department. We will gladly offer a solution for you.

03.11.2012
 
LAN Controller New Functions and Features

LAN Controller New Functions and Features

Check the update document for the LAN Controller describing new firmware with more features and options. Download the PDF here.

LAN Controller at EV-POWER.EU

01.11.2012
 
The BMS 123 CBU modules mounted

The BMS 123 CBU modules mounted

We are installing the demo instalation for the BMS 123 system to demonstrate the function for the GridFree energy storage solutions. Keep checking our blog for more details coming.

27.10.2012
 
Customer project reference: Solar offgrid installation with WB cells

Customer project reference: Solar offgrid installation with WB cells

Harvesting the solar power from the photovoltaic modules 240Wp -12 pcs, 2880Wp. Storing energy into Winston battery LYP200AHA, 32pcs, connected in 48V/400Ah battery system. Making the 230V AC network using SLI inverters 1500VA, 4pcs, 6kVA max power.

07.10.2012
 
FAQ: RT-BMS power-on and settings after STAND-BY

FAQ: RT-BMS power-on and settings after STAND-BY

Question: At the general power on (+12V) all the contactors are connected for short time. Is it a normal operation?

Answer: Yes, this is a safety checkup of all contactors and signal lights. This is to confirm that all of these outputs are working properly.

This logic is the same in your car:  when you turn on the starting key in your car,  all important signal lights on the dash board will light briefly to confirm that the signalization is OK (like airbags, EPS, motor oil and other lights)

Question: After the power-on, the unit performs a sort of scan of the system. The numbers of 01.00 to 01.63 (02.00 to 02.63, and 03.00 to 03.63) was displayed. This behavior is also present if we set a number of 4 cells on the system. Is it a normal behavior?

Answer: Yes, this is normal. After power-on the Master unit scans all possible combination (3x 64) to locate any CBU on the data line bus. This is for safety reason to confirm that the communication with all CBU is regular. Also it can help to locate any CBU that would be miss-addressed.

   ...more >>

16.09.2012
 
The initial testing of the mFi technology by UBNT

The initial testing of the mFi technology by UBNT

The mFi is an easy machine to machine communication solution combining the proprietary mFi protocol with the LAN (IP network) access to the devices.

12.09.2012
 
Plug-in Hybrid Refuse Collection Vehicle

Plug-in Hybrid Refuse Collection Vehicle

GWL/Power has supplied LiFePO4 Cells and the complete RT-BMS system to be used in France by SEMAT Company - ZOELLER Group, for their Plug-in Hybrid RCV (Refuse Collection Vehicle) with the Electrical Zoeller Lifter “E-Rotary”, on the PREMIUM “HYBRIS TECH” Chassis made by RENAULT TRUCKS. This hybrid RCV was presented at the “IAA” HANOVER 2012.

10.09.2012
 
The Drawings and the Diagrams for the RL709 Latching relays

The Drawings and the Diagrams for the RL709 Latching relays

(see pricing here)

10.09.2012
 
DC Power Latching Relay 100A, Coil 12V and 48V

DC Power Latching Relay 100A, Coil 12V and 48V

High current latching relay designed for AC and DC voltage with a maximum current 100A DC (at 48VDC) or 120A AC (at 250VAC). The advantage of the lachting relay is that there is no need for continueous powering of the operating coil.

The voltage of the operating coil is 12V or 48V DC. See our offer at EV-POWER.EU

   ...more >>

03.09.2012
 
More photos of the DC contactors

More photos of the DC contactors

The DC contactors have the auxiliary switching contacts on the top of the main DC contactor. Order on-line here: http://www.ev-power.eu/DC-Contactors/

02.09.2012
 
DC Contactor Specifications and Dimensions

DC Contactor Specifications and Dimensions

Check the dimensions and the parameters of the DC power contactors. These DC Contactors are designed for 6V to 80V DC.

See our offer here: http://www.ev-power.eu/DC-Contactors/

09.08.2012
 
FAQ:  Balancing, overcharging and over heating of the CBU modules

FAQ:  Balancing, overcharging and over heating of the CBU modules

Question: I have the RT-BMS installed on 16 cells. It seems to work OK. Only the balancing does not seem to be working properly. The voltage on some of the cells goes up to 4.00V and the CBU does not seem to control this.  The BMS will switch off the charger for some time, but the cells are not fully charged.

Answer: Please note that the balancing current of the CBU is maximal 5A for the standard version and maximal 10A for the continues to grow, it will signal the full stop of charging (BMS pin B5 – Charging MAIN).   The charging current needs to be reduced bellow the balancing currents of the CBUs to allow for the balancing of the cells without voltage increase.

   ...more >>

12.07.2012
 
FAQ: Upgrading older BMS systems

Question: I purchased the RT-BMS from your company in 2009. I have a friend who purchased the BMS system from you in 2012. It is obvious that there are some key differences in the BMS system. It seems that my system has some bugs and problems.  How to solve these problems?

Answer: First thank you for using the RT-BMS system in your application. However, please understand this point: The BMS you purchased in 2009 was produced more than 3 years ago.  From that time till now, some major hardware (HW) improvements were made in the later HW revisions. Also the software (firmware) inside the units was upgraded significantly.  Even the managing software (for PC) was changed completely.

All this information about these updates was regularly published at our support pages. Special limited offers were provide back then:

We tell you honestly, that your version of the BMS is already outdated, no longer supported and can no longer reflect the improvements that were already done.

   ...more >>

02.07.2012
 
FAQ: SBM questions

It is possible to change the voltage levels (thresholds) for the SBM settings?

  • No, it is not possible. The SBM boards are sold as they are. There is no way for users to change the voltage level settings. (For large quantity orders - 100 pcs and more - it may be possible to design a custom setting version of the SBM boards.)

Is it possible to use the SBM for 12 cells with less cells (e.g. only 8 cells or 9 cells)?

  • No, it is not possible. The board must be used with the exact number of cells. All cells must be connected; otherwise the board does not work properly. (For large quantity orders - 100 pcs and more - it may be possible to design a SBM with a customer number of cells.)

After deep discharge, how to restore the function of the battery pack?

  • First of all the SBM should be used only as a „last resort“ protection measure. This means you should monitor the battery pack and stop discharging before the voltage goes too much down. The SBM should not be used to replace such monitoring. 
  • Secondly, if the pack gets discharged deeply and the SBM makes the protection, we suggest recharging the battery pack as soon as possible.
  •    ...more >>

21.06.2012
 
LAN controller with the relay – your second brain

LAN controller with the relay – your second brain

The LAN controller is a very smart device that can help you to manage a lot of equipment based on the detection of measured values and a time schedule. It is possible to connect a variety of detectors or signal sensors.

The current status of the inputs can be monitored on-line over Internet using the web server. The settings of the LAN controller are made remotely over web page as well.  The status data can be also reported using the SNMP protocol. This allows to process statistics, get the history of events, etc.

In addition the LAN controller allows sending data using plain email. This means you can get the information to any PC or pocket device (e.g. smart-phone) without the need to check the web page.

   ...more >>

12.06.2012
 
Another set of photos of the SBM boards

Another set of photos of the SBM boards

You can see that all SBM are identical in the functional design and they differ only by the number of cells that need to be connected (4/8/12/16) and the current rating (10A or 60A).

12.06.2012
 
FAQ: Detailed drawing of the SBM installation

FAQ: Detailed drawing of the SBM installation

12.06.2012
 
Simple Battery Management Board (SBM)

Simple Battery Management Board (SBM)

The easiest way to protect a lithium battery pack. The SBM board manages a pack of cells and disconnects the load under any unfavorable circumstances: cell over voltage, cell under voltage.

The SBM is connected between the battery pack and the load and the charger. There are additional wires from single cells to the SBM to monitor each cell. (Marking of the contacts: B+/B- to connect to the battery; B1, B2, B3….. to connect to each cell; CH+/CH- to connect charger (optional); P+/P- the whole PACK (battery with SBM) output to the load.)

Check the PDF with detailed specification of the SBM boards and their installation.

See additional tips for the installation at the GWL/blog section for SBM

   ...more >>

06.06.2012
 
RT-BMS Coolers (Heat Sinks) for the CBU modules

RT-BMS Coolers (Heat Sinks) for the CBU modules

We have enlarged the offer for RT-BMS system with high-quality heat sinks. These are designed to be used with the CBU units to allow proper cooling during the balancing. We offer 3 models (sizes and profiles A75M, ZH-7504, ZH-7505)

 

16.04.2012
 
Cell Ballancing Module (CBM) - example of installation

Cell Ballancing Module (CBM) - example of installation

An examples of CBM installation. The cable hooks are soldered on to the PCB directly.

14.04.2012
 
RT-BMS Connection to the TC Chargers

RT-BMS Connection to the TC Chargers

The diagram shows the interconnection of the TC chargers and RT-BMS Master control unit. Color of wires and codes is shown in the table below on the diagram.

11.04.2012
 
RT-BMS Monitor Screen Demonstration

RT-BMS Monitor Screen Demonstration

   ...more >>

11.04.2012
 
RT-BMS Monitor unit released - product and manual information

RT-BMS Monitor unit released - product and manual information

RT-BMS data monitor unit with a touch display (for RT-BMS Master unit).  Designed to read and display data from all software versions of RT-BMS Master unit starting from HW version 2.0. The BMS Master Unit is connected to the board using a special I2C to RS232 cable.

In addition to the display of the data, the monitor can be configured to save gathered data from the BMS to a CSV file to be downloaded to your PC.

Check the RT-BMS Monitor documentation on-line.

 

16.03.2012
 
The video of the installation of the RT-BMS components

 

The video of the installation of the RT-BMS components

Check the instructive video to see the components of the RT-BMS system and their installation step by step. Check the pricing of the RT-BMS components on-line.

14.02.2012
 
A BMS-Master with heavily burnt components

A BMS-Master with heavily burnt components

… well, we all learn by mistakes. Such mistakes however are not covered under the manufacturer’s warranty for the product’s performance and specifications.

26.01.2012
 
CAN Bus equipment operation

 

CAN Bus equipment operation

Question: I have a BMS with CAN option. I have a battery charger with CAN connector, I also have a dash board (display unit) with CAN option.  How can I make these components work together over the CAN bus?

Answer: In most cases you need a master CAN bus unit to make the equipment work together. Most of the CAN bus equipment is only either sending data (Read Only mode) or receiving commands (Write Only mode). This equipment has no additional logic to make decisions of operation for other equipment or to control it. The logic of the operation must be set by the master CAN bus unit.

Example:  BMS system is sending data (about the status of the battery pack). A ventilator with CAN input is only receiving data (turn on/off and the rotation speed). The BMS itself cannot manage the ventilator. There must be the CAN BUS master unit to process the data from the BMS over CAN and to decide if the temperature is over the limit and when the ventilator is to begin the operation. Then the CAN bus master unit i will send data to the ventilator over the CAN bus.

26.12.2011
 
FAQ: balancing of the cells at the inital charge

FAQ: I have assembled a new battery pack. I have a BMS that balances with 2A of heat discharge on each cell. I keep charging my cells for many hours already and some cells are already full and some cells are not charged yet. What is the problem?

Answer: Please follow the lithium battery operation instructions closely:  the cells must be charged individually to full voltage level (typically 4.0V) before assembling the battery pack. This way the cells will be fully charged and balanced before the first use of the battery pack and there will be no need to balance the cells using the BMS with balancing. (Additionally to the first installation, we recommend to checking the cells of the battery pack from time to time and making the full balancing of all the cells, by means of the individual charging.)

Note: Concerning the balancing using the heat dissipation (over the BMS modules): keep in mind that it takes a lot of time to balance the cells this way. If you have 300Ah cells with +/- 20% misbalance, you need to balance up to 40 Ah of capacity. With 2 A balancing current, you may need 20 hours to finish the balancing. Even more, you waste a lot of energy that will be discharged at the cells that are already fully balanced. That is why we do not recommend to balance the cells this way.

22.12.2011
 
PowerLog Data Storage

PowerLog Data Storage

Description of  logging the data traffic to internal 16MB storage. PowerLog 6S enables to store data during operation of the internal memory.  Please see PDF description.

Note: This instruction supplements Detailed manual / EN /.

26.11.2011
 
FAQ: RT-BMS connection to chargers - the wiring of the pins

 

FAQ: RT-BMS connection to chargers - the wiring of the pins

Please note that there is not any standard of the pins used at the charges to communicate with the BMS.  As seen from the two photos, there may be completely different wiring on different chargers. (Even on the same type of chargers but from different production time).  You always need to check against the information on the sticker at the connector. (Note: if the sticker was lost or removed, there is no way to confirm the wiring.)

FAQ: What type is the connector used at the charger to connect to BMS?

There is usually the Phoenix or WAGO type connector. (Wago 231-104-031-000). Take note that this connector is not designed for frequent manipulations. We suggest you can use other type of connectors that are designed for long life-time.

22.11.2011
 
RT-BMS Programming of the parameters

Download the document with the description of the programming of the parameters of the RT-BMS using the Controller 2 software.

22.11.2011
 
New version of Controller 2 software

Update information for RT-BMS systems: there is a new version of the Controller 2 software (1.3.0) available for download.  The BMS firmware was also updated to the latest version 37.54

16.11.2011
 
FAQ: What is the RT-BMS consumption during stand-by and the operation?

FAQ: What is the RT-BMS consumption during stand-by and the operation?

The total energy consumption of the RT-BMS Master unit (from the 12V board battery) in the stand-by mode is about 5mA. During the operation it is 100 mA and more for each CBU module (about 5mA for each CBU module). The consumption of a setup with 32 cells may have a consumption of 100mA + (32 x 5mA) = 260 mA.  

Tip: If your BMS consumption is significantly higher, your should check your setup, as there may be some problem.

The energy consumption of the CBU modules is taken from the cells themselves. It is about 0.1 mA in a standby mode and 30 mA in operation mode. 

Warning: Please keep in mind that especially with small capacity cells, the cells may be depleted by the CBU modules if left without charging for many weeks.  If you have a system that will be left uncharged for long periods of time, we strongly suggest to disconnect the CBU cells (or any other electronics) from the cells.

16.11.2011
 
RT-BMS software - Controller 2

RT-BMS software - Controller 2

The Real Time Battery Management System (RT-BMS) is now managed by the new software Controller 2. This software is provided free of charge to all the BMS users.

In order to use the new software  “Controller 2”, following requirements must be observed:

A) RT-BMS Master unit HW ver 2.1 must have the slight hardware modification to support the firmware 3.x,
B) The firmware 3.X version must be installed in the RT-BMS Master unit,
C) The USBCOM cable must be the latest version 4i.

Download the Controller2 software here.

Note: if you have the RT-BMS Master unit HW version 2.1 with firmware version 1.X to 2.X you need to continue to use the original RT-BMS software. In case you wish to make an update to software version 3.X, it is necessary to perform the hardware modification as well. This hardware modification is a paid service. Please contact us for details concerning the update.

16.11.2011
 
Real Time Battery Management System (RT-BMS) - Product Update Information

 

Real Time Battery Management System (RT-BMS) - Product Update Information (RT-BMS MASTER Hardware Version 2.1 - Software version 3.X)

Starting from November 2011, the Real Time Battery Management System (RT-BMS) has following updates to the functions of the RT-BMS Master unit.

1. Hardware modification of the RT-BMS Master Unit to support the new sw 3.X
2. Hardware modification of the  USBCOM communication cable
3. New internal software (firmware) 3.x
4. Completely new software “Controller 2”
5. Remote software update for the RT-BMS unit  (MGM Flasher v3.0)

Download the document with information about the updates (PDF).

14.11.2011
 
RT-BMS Cell Balancing Module dimensions and mounting specifications

 

RT-BMS Cell Balancing Module dimensions and mounting specifications

The drawings show the CBU sizes and installation.

14.11.2011
 
The overview of the addressing of the RT-BMS modules

The overview of the addressing of the RT-BMS modules

14.11.2011
 
Sample photos of a RT-BMS setup

 

Sample photos of a RT-BMS setup

Photos take during the Lithium Battery Expert Training.

14.11.2011
 
Photos of an installation of the RT-BMS

 

Photos of an installation of the RT-BMS

Example of the initial installation of the CBU units. Take note of the size of the cooler to allow good release of the energy. (Photos - courtesy of our customer)

09.11.2011
 
the CBM unit balances the voltage of a cell

 

The diagram showing how the CBM unit balances the voltage of a cell when voltage level has reached over 3.6V.  Check CBM price here.

05.11.2011
 
RT BMS demonstration setup (shown at eCarTec 2011)

RT BMS demonstration setup (shown at eCarTec 2011)

You can see this BMS demonstration installation when visiting our company personally. You will be working with this BMS setup when attending the lithium battery training. We were showing this demonstration at eCarTec 2011 in Munich.

27.10.2011
 
Simple Battery Management Board (SBM)

Simple Battery Management Board (SBM)

The easiest way to protect a lithium battery pack. The SBM board manages a pack of cells and disconnects the load under any unfavourable circumstances: cell over voltage, cell undervoltage.

SBM16/60 - the management board for 16 LFP cells (48V) with power up to 60A. (photo)  Check the PDF with technical specifications for SBM16/60. For higher loads you need to use a DC contactor to be managed by the SBM board. This drawing shows the DC contactor installation.

02.10.2011
 
Harvesting the power of the sun

The charge graph
Two 217Wp panels
The battery pack

Harvesting the power of the sun

We have set up a new configuration to test the solar charging of LFP batteries. Two solar panels (217Wp each) are in a serial string to charge a 48V/90Ah battery pack made of 4 pcs of LP12V 90AH batteries.

During a sunny day in October, we are able to gain more than 2 kWh of energy from the 2 panels. (38Ah at 53V = 2kWh)

Our tests have a multiple purpose: to test the solar charging, to examine different solar controllers, to study the charging of the LFP batteries and finally to make a working solution to disconnect from the grid for ever.

   ...more >>

19.09.2011
 
RT-BMS system CBU Specification and Instruction file

RT-BMS system CBU Specification and Instruction file (download)

We have created a new version of the RT-BMS system CBU specification and instruction manual. It reflects the hardware changes related to RT-BMS CBU modules version 4.0.

(the photo shows the High-power version of the CBU module)

04.09.2011
 
RT-BMS Product Specification and Instruction file

RT-BMS Product Specification and Instruction file (download)

We have updated the RT-BMS product specification and instruction manual. It reflects the hardware changes related to RT-BMS Master v2.1.

30.08.2011
 
RT-BMS software download

RT-BMS software download

The latest verion of the BMS software is available for download: http://www.auto88.cz/_info/BMS/BMS_v2.6_setup.exe

For older PCs:  you need Windows PC with Microsoft FrameWork (MS Dot Net).
If you do not have MS FrameWork, please first install this MS package.
http://www.auto88.cz/_info/BMS/dotnetfx.exe

Note: the software is working only with the RT-BMS running and attached over the USB port.

20.07.2011
 
FAQ:  Battery deeply discharged – what to do?

FAQ:  Battery deeply discharged – what to do?

By mistake I have deeply discharged the 12V LP battery.  When I discover this situation, the voltage of the battery is < 1.5 Volts. How can I restore the battery?

Honestly, there is no way to restore the LP/LFP cells and batteries if there were deeply discharged. (Bellow 2.5V per cell or 10V per 12V battery.) If the battery is deeply discharged the internal structure of the cells is damaged. There is no way to get the battery back. The battery must be replaced with another battery.

Trying to charge this kind of empty battery will only result in even bigger damage and the battery will swell and release the gases!  Never try to “correct” the problem by swift charging!

The only option is to disconnect the battery and wait for some time (hours/days) to see if the voltage returns back to the minimal level.  If the voltage returns by itself, there is still hope that such battery may be charged. However this charging must be done with very small currents (0.1C or less) and the charging must be monitored.  If the voltage does not return and stays low, the battery is dead.

19.07.2011
 
FAQ: “Sudden” battery discharge

FAQ: “Sudden” battery discharge

I have bought a several of LFP cells and made the pack with them to replace the lead-acid battery in my houseboat. The LFP battery was working great and it gives much more capacity than the lead acid. However after several weeks of usage, I came back after the weekend and I found out that the battery is completely discharged. Why this happen?

Please note that unlike the lead acid batteries, the LFP batteries will be completely damaged if you discharge them bellow the minimal voltage (usually >2.5V per cell, or bellow 10V for 12V battery). This may happen if you have some equipment that takes the power from the battery continually. Maybe you simply forget some light or some equipment „on“, and after few days the battery is deeply discharged and damaged forever.

The example:  12V 90AH battery is connected to houseboat with alarm. This alarm takes only 5W of power (12V 0.4A). If the battery has 70% charge, the alarm will discharge the battery in about 150 hours, that is 6 days. If you have some equipment with higher power consumption, the discharge will be much faster, even perhaps less than one day.

   ...more >>

10.07.2011
 
The application of the Cell Ballancing Module

The application of the Cell Ballancing Module

16 CBM units are used to balance the final stage of the charging of the EV scooter GWL/Scooty. The 16 lithium cells make the total of 48V (nominal voltage). Each cell using one CBM for balancing.

22.05.2011
 
The demonstration of function of the CBM boards

The demonstration of function of the CBM boards

The CBM boards (Cell Ballancing Module) will start balancing of the cell as soon as the full charge level is reached. The full charge level is is at 3.60V for LiFePO4 cells.

The diagram shows the charging of a 4-cell battery pack with following configuration:

Cell1 - no CBM board installed
Cell2 - one CBM board installed (balancing up to 1.7A)
Cell3 - two CBM boards installed (balancing up to 3.4A)
Cell4 - three CBM boards installed (balancing up to 5.1A)

The first part of the diagram shows the charging with 1A current. The Cell1 (with no CBM) goes over the 3.8V level and the voltage would increase very rapidly. Cells2, 3, 4 are ballanced with the CBM modules and the voltage is kept bellow 3.6V.

The second part of the diagram shows the charging with 3A current. The Cell1 (with no CBM) goes over the 4.4V level and is OVERCHARGED. The Cells 2 (with one CBM) is balanced and the voltage increases slowly. However ONE CBM (balancing up to 1.7A) is not enough for the 3A charging current. As a result the voltage would also increase above 3.8V, if not stopped. Only Cell3 and Cell4 (with 2 and 3 CBM boards) are ballanced sufficiantly and the voltage is kept bellow 3.6V.

   ...more >>

04.05.2011
 
CBM - Cell Balancing Module - detailed photo

CBM - Cell Balancing Module - detailed photo

04.05.2011
 
Cell Balancing Module (CBM) - easy installation

Cell Balancing Module (CBM) - easy installation

The photo shows a four-cell testing pack with CBM installed. On the right there is a single CBM - balancing up to 1.7A. On the left, there is a cascade of 3 CBMs that increase the balacing current to up to 5A (3x ~1.7A).

04.05.2011
 
Cell Balancing Solved! - The CBM1 module is here

Cell Balancing Solved! - The CBM1 module is here

GWL/Power is introducing the easiest solution to keep your LiFePO4 cells balanced. The CBM module provides the cell balancing whenever the voltage increases over the 3.60V cell balance detection voltage.

Product specifications
Cell Balancing Module to limit the overcharge of single LiFePO4 cell (3.2V)
Balancing detection voltage: 3.60 V (+/- 0.05V)
Balancing release voltage: 3.50 V (+/- 0.05V)
Maximal voltage: <5 V
Balacing current: 0 ~ 1.7 A
Self consumption: < 20 microA
Working temperature: -40 to +125 deg. C
Temperature of resistors: up to 85 deg. C
Dimensions: 55 x 55 x 8 mm

Cell Balancing Module (3.60V- 1.7A) product information

08.04.2011
 
RT-BMS CBU module V4.0 dimensions

RT-BMS CBU module V4.0 dimensions

Check the CBU module dimensions.

14.03.2011
 
Cooling Akumons using computer fans

Cooling Akumons using computer fans

(source Fiat Seicento project)

14.03.2011
 
High speed balancing with high currents using Akumons

High speed balancing with high currents using Akumons

A simple solution using the automotive 12V relay and the 12V halogen bulbs. 

07.03.2011
 
Simple solution to make a 24V battery pack

Two 12V 60Ah batteries
Handle to carry the pack
Fuse and Akumons inside

Simple solution to make a 24V battery pack

Two 12V batteries (here 12V 60A) are packed together. A plastic handle is mounted too, to allow easy carrying of the pack.

A high power fuse (400A) and two Akumons are mounted inside a plastic box.

01.03.2011
 
Testing of the 36V 20AH battery pack with SBM

Testing of the 36V 20AH battery pack with SBM

(SBM - Simple Battery Management)

01.03.2011
 
The detail of the Simple Battery Management (SBM) Board

The detail of the Simple Battery Management (SBM) Board

23.02.2011
 
RT-BMS CAN Bus definition

RT-BMS CAN Bus definition

Following datagrams are sent by the RT-BMS master over the CAN bus at speed of 250 kb/s. The CAN module uses the version 2.0 of the protocol.

Address : 0x14A10101

D0 : Battery pack total capacity (0 .. 100 %)
D1 : Current  (-127 … +126, value * 5 = current [A])
D2 : Total voltage (low byte)
D3 : Total voltage (high byte)  - range 0 … 65535, value / 10 = voltage [V]
D4 : Highest temperature on the cells (-127 … +126 deg. C.)
D5 : Bit 0 - reading, Bit 1 - waiting, Bit 2 - balanicing , Bit 3 - running, Bit 4 - low voltage, Bit 5 - error (not serious), Bit 6 - error (serious)
D6 : The address of the CBU causing last error.
D7 : Internal error code (only for service purposes)

Address : 0x14A10102

D0 : Lowest voltage of the cell (low byte)
D1 : Lowest voltage of the cell (high byte) - range 0-65535, value / 100 = voltage [V]
D2 : The address of the cell with the lowest voltage
D3 : Highest voltage of the cell (low byte)
D4 : Highest voltage of the cell (high byte) - range 0-65535, value / 100 = voltage [V]
D5 : The address of the cell with the highest voltage
D6 : Lowest temperature on the cells (-127 … +126 deg. C.)
D7 : Reserved

   ...more >>

07.02.2011
 
Testing the 20AH cells 

 

Testing the 20AH cells  (from our customer)

Please notice the circuit-braker attached to the pack. 

01.02.2011
 
FAQ: The proper installation the key to success for the BMS function

 

FAQ: The proper installation the key to success for the BMS function

Over the past two years of supporting the customers with the RT-BMS (and other management solutions), we have learned the most frequent installation faults that can cause the BMS system not to be working properly.

Please note, that one  „missing CBU“ can lead to a damage of the whole battery pack, if operated for a long time without inspection.

The frequent installation faults:

  • Improper cabling of the 10 pin flat cable – the result: some of the CBUs are not find during the boot-up of the whole system.  Solution:  check the flat cable and/or replace the cable if needed
  • Humidity, water drops, and wetness on the CBU boards – the result: oxidation of the CBUs, malfunction of the CBUs. Solution:  the CBUs must be protected against moisture and water.  Please change the installation to allow such a protection.
  •    ...more >>

01.02.2011
 
The Float voltage for the LiFeYPO4 batteries

 

The Float voltage for the LiFeYPO4 batteries

Unlike the lead acid batteries, there is no need for lithium batteries to apply the constant voltage to maintain the cells in a fully charged condition. (Typical for lead acid batteries 12V -  Gel 13.05V, Flooded 13.4V and AGM 13.6V values @ 25°C). 

In case you replace the lead acid battery with the LiFeYPO4 battery, it is good to check how the device behaves when charging the battery.  When applying the unmanaged float voltage (all called trickle charge), the voltage for LP 12V battery should be always bellow 14.4V  (3.60V x 4 cells).  Simply said the AGM value of 13.6V should be always OK with the LP batteries / LFP cells.

09.02.2010
 
The ballancing modules of the RT-BMS system

The ballancing modules of the RT-BMS system

Each cell one module. That’s it.

10.01.2010
 
FAQ: Simple balancing using parallel connection

Question: Can I balance the cells by simply connecting all the batteries in parallel?
 
Answer: You can do this, but it will not work effectively. Actually you would need a long, long time (days or weeks) to balance the batteries this way.  Effectively said: you can parallel the batteries if you want them all to discharge to the same voltage level over a period of time.
 
However you cannot think this wayif you have one 100% fully-charged and one 0%-charged battery and you connect them parallel you will get two 50% charged batteries over some time. It does not work this way! 

First: never connect charged and discharged batteries together. Neither in serial nor in parallel.  Use only batteries charged to the same voltage level.

Second: you cannot charge a battery using another battery as a charger. You need a charger to charge. You cannot use a battery to charge another battery. The reason: you need to have a higher potential (voltage level) to charge the battery.

20.12.2009
 
Dynamic-BMS for 12 Volt Lithium Yttrium Iron Batteries

Dynamic-BMS for 12 Volt Lithium Yttrium Iron Batteries

Please see another photo of our D-BMS system for 12V batteries. Get more details here: http://gwl-power.tumblr.com/tagged/D-BMS

15.11.2009
 
Real Time Battery Management System (RT-BMS)

Real Time Battery Management System (RT-BMS)

The RT-BMS System Components Setup - Cell Balancing Unit (Module) the connection description and Master RT-BMS Control Unit - the complete description of connectors, inputs and outputs.

Download - The RT-BMS System Components Setup reference file

15.11.2009
 
The RT-BMS System Components Installation Diagram

The RT-BMS System Components Installation Diagram

The RT-BMS is designed according to the concept of single real-time balancers managing and balancing up to 192 individual cells. The individual cell-balancing units are controlled by the central Master RT-BMS Control Unit.

15.11.2009
 
Real Time Battery Management System (RT-BMS)

Real Time Battery Management System (RT-BMS)

The Real Time Battery Management System (RT-BMS) is an advanced battery management solution for any type of lithium-based cells.  Unlike other management systems, the RT-BMS provides the battery management during the complete charge and discharge cycle. Each cell is managed individually and the master control unit manages the whole chain of cells.

The whole RT-BMS system is compatible with all current types of traction cells (Pb, A123, LiPol, LiFe, LiFePO4, LiFeYPO4, etc.) – i.e. all types of rechargeable cells with an operating voltage between 2.7V and 5.0 Volts.

Please download Real Time Battery Management System (RT-BMS) Product Development Report 2009/11/15

01.11.2009
 
Dynamic-BMS for 12 Volt Lithium Yttrium Iron Batteries

 

Dynamic-BMS for 12 Volt Lithium Yttrium Iron Batteries

The Dynamic Battery Monitor System (BMS) with balancing function is the first worldwide solution to manage series of 12V Lithium Yttrium Iron batteries (LFYP batteries).  The LFYP batteries made by Thunder-Sky are the only direct 12V lithium solution on the world market.  Now you can use 12V lithium batteries instead of many small 3.2V cells.  Read more in Product Development Report 2009/11/01

07.10.2009
 
160AH battery pack

 

This is a photo of a 160AH battery pack using Thunder-Sky LFP/LFYP cells. (source EVC Group web)


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